ANION EFFECTS ON THE STRUCTURAL-PROPERTIES OF BIS(TRIPHENYLPHOSPHINE)COPPER(I) CARBOXYLATE COMPLEXES, [(PPH3)(2)CUO2CR]

The crystal and molecular structure of the 2:1 triphenylphosphine copp er(I) benzoate complex [(PPh3)(2)CuO2CC6H5] have been determined by a room-temperature single-crystal X-ray study. The complex is isomorphou s with the dithiobenzoate analogue, crystallizing in the orthorhombic space group P2(1)2(1)2(1) With a 20.094(5), b 16.929(9), c 10.659(8) A ngstrom, Z 4; conventional R on \F\ was 0.039 for 4261 independent 'ob served' (I > 3 sigma(I)) reflections. Comparison of structural data fo r this and other [(PPh3)(2)CuO2CR] complexes shows that the P-Cu-P ang le and the anion coordination are dependent on both the donor strength of the anion and on steric interactions between the anion and the tri phenylphosphine ligands. The structure of the analogous nitrate comple x [(PPh3)(2)CuNO3] has also been redetermined.